Are all your controllers in the same group? Do they share a majority of similar config?
If the controllers are configured completely differently, then you should split the controllers based on config. That way each group respectively matches a single controller.
If the controllers are all similar with only a few differences, then you can keep them in the same group with controller overrides added. Controller overrides are added on the controller's manage page in AirWave. These overrides let AirWave know it's okay if specific variables are seen instead of the group's desired value.